将4.09、40.9、0.409、0.49、0.904、9.4按从大到小的顺序排列: > > > > > .
0.75== ÷8= %= 成数.
3÷ =× =5: =1.25=.
= .
x除以y的商是,y与x的比是 .
= ÷ ==.